/*
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* Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
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* Author:Mark Yao <mark.yao@rock-chips.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <drm/drm.h>
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#include <drm/drmP.h>
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#include <drm/drm_panel.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/gpio/consumer.h>
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#include <linux/gpio.h>
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#include <linux/regulator/consumer.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/pinctrl/consumer.h>
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#include <linux/platform_device.h>
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#include <linux/pwm.h>
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#include <linux/pwm_backlight.h>
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#include <uapi/drm/rockchip_drm.h>
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#include "rockchip_drm_drv.h"
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#include "rockchip_drm_backlight.h"
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struct sub_backlight {
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struct pwm_device *pwm;
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struct pinctrl *pinctrl;
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struct pinctrl_state *dummy_state;
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struct pinctrl_state *active_state;
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struct drm_crtc *crtc;
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struct device *dev;
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const struct rockchip_sub_backlight_ops *ops;
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struct list_head list;
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};
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#define to_rockchip_backlight_device(x) \
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container_of((x), struct rockchip_drm_backlight, pwm_pdev)
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static LIST_HEAD(backlight_list);
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static int compute_duty_cycle(struct rockchip_drm_backlight *bl,
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int brightness, int period)
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{
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unsigned int lth = bl->lth_brightness;
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int duty_cycle;
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duty_cycle = bl->levels[brightness];
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return (duty_cycle * (period - lth) / bl->scale) + lth;
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}
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static void rockchip_pwm_power_on(struct rockchip_drm_backlight *bl,
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struct pwm_device *pwm, int brightness)
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{
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struct pwm_args pargs;
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int duty_cycle;
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pwm_get_args(pwm, &pargs);
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duty_cycle = compute_duty_cycle(bl, brightness, pargs.period);
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pwm_config(pwm, duty_cycle, pargs.period);
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pwm_enable(pwm);
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}
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static void rockchip_pwm_power_off(struct rockchip_drm_backlight *bl,
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struct pwm_device *pwm)
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{
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struct pwm_args pargs;
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struct pwm_state state;
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pwm_get_state(pwm, &state);
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if (!state.enabled)
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return;
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pwm_get_args(pwm, &pargs);
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pwm_config(pwm, 0, pargs.period);
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pwm_disable(pwm);
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}
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static void rockchip_backlight_power_on(struct rockchip_drm_backlight *bl)
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{
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int err;
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if (bl->enabled)
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return;
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err = regulator_enable(bl->power_supply);
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if (err < 0)
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dev_err(bl->dev, "failed to enable power supply\n");
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if (bl->enable_gpio)
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gpiod_set_value(bl->enable_gpio, 1);
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bl->enabled = true;
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}
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static void rockchip_backlight_power_off(struct rockchip_drm_backlight *bl)
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{
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if (!bl->enabled)
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return;
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if (bl->enable_gpio)
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gpiod_set_value(bl->enable_gpio, 0);
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regulator_disable(bl->power_supply);
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bl->enabled = false;
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}
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static int backlight_parse_dt(struct rockchip_drm_backlight *bl)
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{
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struct device_node *node = bl->dev->of_node;
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struct device *dev = bl->dev;
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struct property *prop;
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size_t size;
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int length;
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u32 value;
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int ret, i;
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if (!node)
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return -ENODEV;
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bl->pwm = devm_pwm_get(dev, NULL);
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if (IS_ERR(bl->pwm)) {
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dev_err(dev, "unable to request PWM: %ld\n",
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PTR_ERR(bl->pwm));
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return PTR_ERR(bl->pwm);
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}
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if (!bl->pwm->chip->dev->pins) {
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dev_err(dev, "failed to find pwm pinctrl\n");
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return -ENODEV;
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}
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bl->dummy_state = pinctrl_lookup_state(bl->pwm->chip->dev->pins->p,
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"dummy");
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if (IS_ERR_OR_NULL(bl->dummy_state)) {
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dev_err(dev, "failed to find pwm dummy state\n");
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return -ENODEV;
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}
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bl->enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_ASIS);
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if (IS_ERR(bl->enable_gpio)) {
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dev_err(dev, "unable to request enable gpio: %ld\n",
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PTR_ERR(bl->enable_gpio));
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return PTR_ERR(bl->enable_gpio);
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}
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bl->power_supply = devm_regulator_get(dev, "power");
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if (IS_ERR(bl->power_supply)) {
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dev_err(dev, "unable to request power supply: %ld\n",
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PTR_ERR(bl->power_supply));
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return PTR_ERR(bl->power_supply);
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}
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/* determine the number of brightness levels */
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prop = of_find_property(node, "brightness-levels", &length);
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if (!prop)
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return -EINVAL;
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bl->max_brightness = length / sizeof(u32);
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if (bl->max_brightness <= 0)
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return -EINVAL;
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/* read brightness levels from DT property */
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size = sizeof(*bl->levels) * bl->max_brightness;
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bl->levels = devm_kzalloc(dev, size, GFP_KERNEL);
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if (!bl->levels)
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return -ENOMEM;
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ret = of_property_read_u32_array(node, "brightness-levels",
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bl->levels,
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bl->max_brightness);
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if (ret < 0)
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return ret;
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ret = of_property_read_u32(node, "default-brightness-level", &value);
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if (ret < 0)
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return ret;
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bl->dft_brightness = value;
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bl->max_brightness--;
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for (i = 0; i <= bl->max_brightness; i++)
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if (bl->levels[i] > bl->scale)
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bl->scale = bl->levels[i];
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return 0;
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}
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void rockchip_drm_backlight_update(struct drm_device *drm)
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{
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struct rockchip_drm_private *private = drm->dev_private;
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struct rockchip_drm_backlight *bl = private->backlight;
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struct drm_connector *connector;
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struct sub_backlight *sub;
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struct rockchip_crtc_state *s;
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struct drm_crtc *crtc;
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bool backlight_changed = false;
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if (!bl || !bl->connector)
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return;
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sub = bl->sub;
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connector = bl->connector;
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crtc = connector->state->crtc;
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if (!crtc) {
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if (sub) {
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bl->sub = NULL;
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backlight_changed = true;
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}
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} else if (!sub || sub->dev->of_node != crtc->port) {
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s = to_rockchip_crtc_state(crtc->state);
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if (s->cabc_mode != ROCKCHIP_DRM_CABC_MODE_DISABLE) {
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list_for_each_entry(sub, &backlight_list, list) {
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if (sub->crtc == crtc) {
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bl->sub = sub;
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backlight_changed = true;
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break;
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}
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}
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} else if (bl->sub) {
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bl->sub = NULL;
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backlight_changed = true;
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}
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}
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if (backlight_changed)
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backlight_update_status(bl->bd);
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}
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EXPORT_SYMBOL(rockchip_drm_backlight_update);
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int of_rockchip_drm_sub_backlight_register(struct device *dev,
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struct drm_crtc *crtc,
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const struct rockchip_sub_backlight_ops *ops)
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{
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struct sub_backlight *sub;
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struct pwm_device *pwm;
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pwm = devm_pwm_get(dev, NULL);
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if (IS_ERR(pwm)) {
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dev_dbg(dev, "unable to request PWM\n");
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return PTR_ERR(pwm);
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}
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sub = devm_kzalloc(dev, sizeof(*sub), GFP_KERNEL);
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if (!sub)
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return -ENOMEM;
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sub->pinctrl = devm_pinctrl_get(pwm->chip->dev);
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if (IS_ERR(sub->pinctrl)) {
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dev_err(dev, "failed to find pwm pinctrl\n");
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return PTR_ERR(sub->pinctrl);
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}
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sub->dummy_state = pinctrl_lookup_state(sub->pinctrl, "dummy");
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if (IS_ERR_OR_NULL(sub->dummy_state)) {
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dev_err(dev, "failed to find pwm dummy state\n");
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return -ENODEV;
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}
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sub->active_state = pinctrl_lookup_state(sub->pinctrl, "active");
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if (IS_ERR_OR_NULL(sub->active_state)) {
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dev_err(dev, "failed to find pwm active state\n");
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return -ENODEV;
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}
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pwm_adjust_config(pwm);
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sub->pwm = pwm;
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sub->dev = dev;
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sub->crtc = crtc;
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sub->ops = ops;
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INIT_LIST_HEAD(&sub->list);
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list_add_tail(&sub->list, &backlight_list);
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return 0;
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}
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EXPORT_SYMBOL(of_rockchip_drm_sub_backlight_register);
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static int rockchip_drm_backlight_bind(struct device *dev,
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struct device *master, void *data)
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{
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struct drm_device *drm_dev = data;
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struct rockchip_drm_private *private = drm_dev->dev_private;
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struct rockchip_drm_backlight *bl = dev_get_drvdata(dev);
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struct drm_connector *connector;
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struct drm_panel *panel;
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struct device_node *backlight_np;
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private->backlight = bl;
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mutex_lock(&drm_dev->mode_config.mutex);
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drm_for_each_connector(connector, drm_dev) {
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panel = drm_find_panel_by_connector(connector);
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if (!panel || !panel->dev)
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continue;
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backlight_np = of_parse_phandle(panel->dev->of_node,
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"backlight", 0);
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if (backlight_np == dev->of_node) {
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bl->connector = connector;
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break;
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}
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}
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mutex_unlock(&drm_dev->mode_config.mutex);
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if (!bl->connector) {
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dev_warn(dev, "failed to bind drm backlight\n");
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return -ENODEV;
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}
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return 0;
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}
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static void rockchip_drm_backlight_unbind(struct device *dev,
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struct device *master, void *data)
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{
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struct drm_device *drm_dev = data;
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struct rockchip_drm_private *private = drm_dev->dev_private;
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struct rockchip_drm_backlight *bl = dev_get_drvdata(dev);
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private->backlight = NULL;
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bl->connector = NULL;
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}
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static const struct component_ops rockchip_drm_backlight_component_ops = {
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.bind = rockchip_drm_backlight_bind,
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.unbind = rockchip_drm_backlight_unbind,
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};
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static int
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rockchip_drm_backlight_update_status(struct backlight_device *backlight)
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{
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int brightness = backlight->props.brightness;
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struct rockchip_drm_backlight *bl = bl_get_data(backlight);
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struct sub_backlight *sub = bl->sub;
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struct sub_backlight *current_sub = bl->current_sub;
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bool async;
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if (backlight->props.power != FB_BLANK_UNBLANK ||
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backlight->props.fb_blank != FB_BLANK_UNBLANK ||
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backlight->props.state & BL_CORE_FBBLANK)
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brightness = 0;
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if (!sub || brightness <= 0) {
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if (current_sub)
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pinctrl_select_state(current_sub->pinctrl,
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current_sub->dummy_state);
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if (brightness > 0) {
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rockchip_pwm_power_on(bl, bl->pwm, brightness);
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rockchip_backlight_power_on(bl);
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} else {
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rockchip_backlight_power_off(bl);
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rockchip_pwm_power_off(bl, bl->pwm);
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}
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pinctrl_pm_select_default_state(bl->pwm->chip->dev);
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if (current_sub) {
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rockchip_pwm_power_off(bl, current_sub->pwm);
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if (current_sub->ops->config_done)
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current_sub->ops->config_done(current_sub->dev,
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true);
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}
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return 0;
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}
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pinctrl_select_state(bl->pwm->chip->dev->pins->p, bl->dummy_state);
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async = !!current_sub;
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if (current_sub && sub != current_sub) {
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pinctrl_select_state(current_sub->pinctrl,
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current_sub->dummy_state);
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async = false;
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}
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rockchip_pwm_power_on(bl, sub->pwm, brightness);
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if (current_sub && sub != current_sub) {
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rockchip_pwm_power_on(bl, current_sub->pwm, brightness);
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if (current_sub->ops->config_done)
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current_sub->ops->config_done(current_sub->dev, true);
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}
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if (sub->ops->config_done)
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sub->ops->config_done(sub->dev, async);
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pinctrl_select_state(sub->pinctrl, sub->active_state);
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rockchip_backlight_power_on(bl);
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bl->current_sub = sub;
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return 0;
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}
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static const struct backlight_ops rockchip_drm_backlight_ops = {
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.update_status = rockchip_drm_backlight_update_status,
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};
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static int rockchip_drm_backlight_probe(struct platform_device *pdev)
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{
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struct rockchip_drm_backlight *bl;
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struct backlight_properties props;
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struct device *dev = &pdev->dev;
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struct device_node *node = dev->of_node;
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int initial_blank = FB_BLANK_UNBLANK;
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int ret;
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bl = devm_kzalloc(dev, sizeof(*bl), GFP_KERNEL);
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if (!bl)
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return -ENOMEM;
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bl->dev = dev;
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ret = backlight_parse_dt(bl);
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if (ret < 0) {
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dev_err(&pdev->dev, "failed to find parse backlight dts\n");
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return ret;
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}
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bl->enabled = false;
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if (bl->enable_gpio) {
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/*
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* If the driver is probed from the device tree and there is a
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* phandle link pointing to the backlight node, it is safe to
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* assume that another driver will enable the backlight at the
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* appropriate time. Therefore, if it is disabled, keep it so.
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*/
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if (node && node->phandle &&
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gpiod_get_direction(bl->enable_gpio) == GPIOF_DIR_OUT &&
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gpiod_get_value(bl->enable_gpio) == 0)
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initial_blank = FB_BLANK_POWERDOWN;
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else
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gpiod_direction_output(bl->enable_gpio, 1);
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}
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if (node && node->phandle && !regulator_is_enabled(bl->power_supply))
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initial_blank = FB_BLANK_POWERDOWN;
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pwm_adjust_config(bl->pwm);
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memset(&props, 0, sizeof(props));
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props.type = BACKLIGHT_RAW;
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props.max_brightness = bl->max_brightness;
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bl->bd = backlight_device_register(dev_name(dev), dev, bl,
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&rockchip_drm_backlight_ops, &props);
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if (IS_ERR(bl->bd)) {
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dev_err(&pdev->dev, "failed to register backlight\n");
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ret = PTR_ERR(bl->bd);
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return ret;
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}
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bl->bd->props.brightness = bl->dft_brightness;
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bl->bd->props.power = initial_blank;
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backlight_update_status(bl->bd);
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platform_set_drvdata(pdev, bl);
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ret = component_add(dev, &rockchip_drm_backlight_component_ops);
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if (ret)
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backlight_device_unregister(bl->bd);
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return ret;
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}
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static int rockchip_drm_backlight_remove(struct platform_device *pdev)
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{
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struct rockchip_drm_backlight *bl = platform_get_drvdata(pdev);
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backlight_device_unregister(bl->bd);
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component_del(&pdev->dev, &rockchip_drm_backlight_component_ops);
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return 0;
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}
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static const struct of_device_id rockchip_drm_backlight_dt_ids[] = {
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{.compatible = "rockchip,drm-backlight",
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.data = NULL },
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{}
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};
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MODULE_DEVICE_TABLE(of, rockchip_drm_backlight_dt_ids);
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static struct platform_driver rockchip_drm_backlight_driver = {
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.probe = rockchip_drm_backlight_probe,
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.remove = rockchip_drm_backlight_remove,
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.driver = {
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.name = "drm-backlight",
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.of_match_table =
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of_match_ptr(rockchip_drm_backlight_dt_ids),
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},
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};
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module_platform_driver(rockchip_drm_backlight_driver);
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MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");
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MODULE_DESCRIPTION("Rockchip Drm Backlight Driver");
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MODULE_LICENSE("GPL v2");
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